Drags Defects
Defects
Cause
Deformation of the casting during ejection due to undercuts in the mold. Undercuts can result from buildup on the die surface or die erosion caused by solder.
Corrections
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Refer to corrections for buildup, solder, and erosion.
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Ensure a smooth die surface: Completely polish out any machining marks on the die surface to minimize drag.
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Verify draft angles: Check that draft angles are adequate to facilitate smooth ejection of the casting.
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Reduce the temperature of the steel causing the drag: Cool the specific area of the die experiencing drag, either by applying a spray coolant or using high heat transfer die materials.
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Monitor metal temperature: Maintain proper metal temperature to control its flow characteristics and minimize drag formation.
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Please note that the information provided in this article is intended to be a general guide to the causes and corrections of drags in metal castings. However, it is important to note that the specific cause and correction of any particular defect will vary depending on the specific casting process, alloy, and other factors. Therefore, it is important to consult with an experienced and professional engineer to ensure that the correct diagnosis is made and the most suitable correction is chosen.